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import { AbsoluteTime, TranslatedString } from "@gnu-taler/taler-util";
import { ComponentChildren, VNode, createContext, h } from "preact";
import { MutableRef, StateUpdater, useRef } from "preact/hooks";
export interface FormType<T> {
value: MutableRef<Partial<T>>;
initialValue?: Partial<T>;
onUpdate?: StateUpdater<T>;
computeFormState?: (v: T) => FormState<T>;
}
//@ts-ignore
export const FormContext = createContext<FormType<any>>({});
export type FormState<T> = {
[field in keyof T]?: T[field] extends AbsoluteTime
? Partial<InputFieldState>
: T[field] extends object
? FormState<T[field]>
: Partial<InputFieldState>;
};
export interface InputFieldState {
/* should show the error */
error?: TranslatedString;
/* should not allow to edit */
readonly: boolean;
/* should show as disable */
disabled: boolean;
/* should not show */
hidden: boolean;
}
export function FormProvider<T>({
children,
initialValue,
onUpdate,
computeFormState,
}: {
initialValue?: Partial<T>;
onUpdate?: (v: Partial<T>) => void;
computeFormState?: (v: T) => FormState<T>;
children: ComponentChildren;
}): VNode {
const value = useRef(initialValue ?? {});
return (
<FormContext.Provider
value={{ initialValue, value, onUpdate, computeFormState }}
>
<form>{children}</form>
</FormContext.Provider>
);
}
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